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  #1  
Old 06-24-2010, 10:23 PM
Jeff Jeff is offline
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Default Fixed programmable note length for the MD24

John, I'm willing to chip in $100 to have that feature added to the MD24.

I and some others really would benefit from a programmable note length. I will need to add an R/C fixed timing circuit into the board, or edit the MIDI file upstream to play in my application. A software feature resolves this completely.

Thanks for reading this. I know $100 isn't much for the effort needed to write/complile/test/distribute, but it's basically all I can afford. Perhaps the other users needing this will chime in (pun intended).

Regards, Jeff Thomas
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  #2  
Old 06-28-2010, 02:02 PM
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I'll see what I can do in the next few weeks. Thanks for the offer, but I'll only require the cost of the replacement microcontroller IC for those that would like to have it.
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  #3  
Old 07-06-2010, 01:57 AM
ButchB ButchB is offline
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John,
Thanks for being so responsive to looking into this request. I will definitely buy a replacement controller if you decide to make the changes.

regards,
Butch
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  #4  
Old 07-15-2010, 09:58 PM
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Hello John, just returned from a few weeks vacation and read the great news.

I'll also be happy to buy a new MCU

Regards, Jeff
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  #5  
Old 09-19-2010, 08:08 PM
ButchB ButchB is offline
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Default Any conclusion on modifying the MD24?

Hi John,

I was wondering if you had come to any conclusion about modfiying the MCU to make the note length programmable on the MD24.

thanks

Butch
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  #6  
Old 09-20-2010, 04:50 PM
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Guys, sorry for the delay. I am working on this feature.

After reviewing the MD24 code, I think the easiest (and fastest) way to get this done is to have a global 7-bit pulse length variable. If fixed length pulses are enabled by the user, all outputs using note-trigger modes will automatically have the fixed-length output pulse.

I was thinking of having a precision of 4ms--you could set a pulse length of between 4ms and 508ms (127 * 4) in 4ms steps.

The accuracy of the pulse would be roughly 4ms as well. In other words, if you choose a pulse length of 100ms, any given output pulse will be somewhere between 96ms and 100ms.

How does that sound? Would a different precision be better? We could make it 1ms, .5ms, 16ms, etc--but the choice will have an effect on both accuracy and maximum pulse length.

Let me know what you think.
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  #7  
Old 09-20-2010, 05:11 PM
Jeff Jeff is offline
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Quote:
Originally Posted by John View Post
Let me know what you think.
Excellent John. This will allow me (and others) to use existing MIDI music files with a chime rack/marimbas/etc and not have to edit the individual note lengths. The 4ms resolution is so fine that realistically anything less than a ~50ms variation is in the noise band for my application.

Thanks, jeff
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  #8  
Old 09-21-2010, 12:46 AM
ButchB ButchB is offline
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John,
Yes, that will work great for me too. 4ms is more than enough resolution for my application.

Thanks much
Butch
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  #9  
Old 09-22-2010, 07:17 PM
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Default Updated Firmware Manual

Here's a link to the updated firmware manual. I'll post again when the firmware is ready to go...

http://support.codeandcopper.com/hl/...re-Ver-1-2.pdf
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  #10  
Old 09-22-2010, 07:31 PM
ButchB ButchB is offline
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Default Updated firmware

That's super. I will be standing by with my credit card fired up and ready to go.

thanks
Butch
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  #11  
Old 09-28-2010, 04:07 PM
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Guys, the beta firmware is ready to ship. I'll send PMs to make arrangements.

I also re-uploaded the firmware manual. The only additional difference is that the PWM config message was changed slightly. If you're not using the servo control features, this won't matter to you.
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  #12  
Old 09-29-2010, 02:00 PM
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Let me know how the firmware works out.

Another note--I'm not making this the "production" firmware, so if you happen to recommend it to anyone else, they'll need to make a special request for it. The MD24 will continue to ship with firmware version 1.1 for now.
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  #13  
Old 10-14-2011, 03:45 PM
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I have ported the same update to the newer Rev G MD24. More info here:

http://forum.highlyliquid.com/showthread.php?t=661
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